main.c

   1 /* Variations on RockDodger
   2  * Space Rocks copyright (C) 2001 Paul Holt <pad@pcholt.com>
   3  *
   4  * Project fork 2004, Jason Woofenden and Joshua Grams.
   5  * (a whole bunch of modifications and project rename)
   6
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <argp.h>
  23 #include <math.h>
  24 #include <SDL/SDL.h>
  25 #include <SDL/SDL_image.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "SFont.h"
  32
  33 #include "args.h"
  34 #include "common.h"
  35 #include "config.h"
  36 #include "dust.h"
  37 #include "file.h"
  38 #include "globals.h"
  39 #include "mt.h"
  40 #include "rocks.h"
  41 #include "score.h"
  42 #include "shape.h"
  43 #include "sound.h"
  44
  45 // ************************************* VARS
  46 // SDL_Surface global variables
  47 SDL_Surface
  48         *surf_screen,   // Screen
  49         *surf_b_variations, // "variations" banner
  50         *surf_b_on, // "on" banner
  51         *surf_b_rockdodger, // "rockdodger" banner
  52         *surf_b_game,   // Title element "game"
  53         *surf_b_over,   // Title element "over"
  54         *surf_ship,             // Spaceship element
  55         *surf_life,     // Indicator of number of ships remaining
  56         *surf_rock[NROCKS],     // THE ROCKS
  57         *surf_font_big; // The big font
  58
  59
  60 SFont_Font *g_font;
  61
  62 // Structure global variables
  63 struct enginedots edot[MAXENGINEDOTS], *dotptr = edot;
  64 struct bangdots bdot[MAXBANGDOTS], *bdotptr = bdot;
  65
  66 // Other global variables
  67 char topline[1024];
  68 char *initerror = "";
  69
  70 struct shape shipshape;
  71 float shipx = XSIZE/2, shipy = YSIZE/2; // X position, 0..XSIZE
  72 float shipdx = SCREENDXMIN, shipdy = 0.0;       // Change in X position per tick.
  73 float screendx = SCREENDXMIN, screendy = 0.0;
  74 float xscroll, yscroll;
  75 float back_dist;
  76
  77 // all movement is based on t_frame.
  78 float t_frame;  // length of this frame (in ticks = 1/20th second)
  79 int ms_frame;   // length of this frame (milliseconds)
  80 int ms_end;     // end of this frame (milliseconds)
  81
  82 float bangx, bangy, bangdx, bangdy;
  83
  84 int nships,score;
  85 int jets = 0;
  86
  87 float fadetimer = 0, faderate;
  88
  89 int pausedown = 0, paused = 0;
  90
  91 // bangdot start (bd1) and end (bd2) position:
  92 int bd1 = 0, bd2 = 0;
  93
  94 enum states {
  95         TITLE_PAGE,
  96         GAMEPLAY,
  97         DEAD_PAUSE,
  98         GAME_OVER,
  99         HIGH_SCORE_ENTRY,
 100         HIGH_SCORE_DISPLAY
 101 };
 102 enum states state = TITLE_PAGE;
 103 float state_timeout = 600.0;
 104
 105 #define NSEQUENCE 2
 106 char *sequence[] = {
 107         "Press SPACE to start",
 108         "http://herkamire.com/jason/vor"
 109 };
 110
 111 int bangdotlife, nbangdots;
 112 Uint16 heatcolor[W*3];
 113
 114 char *data_dir;
 115 extern char *optarg;
 116 extern int optind, opterr, optopt;
 117
 118 #define TO_TICKS(seconds) ((seconds)*20*opt_gamespeed)
 119
 120 // ************************************* FUNCS
 121
 122 void
 123 init_engine_dots() {
 124         int i;
 125         for(i = 0; i<MAXENGINEDOTS; i++) {
 126                 edot[i].active = 0;
 127         }
 128 }
 129
 130 void
 131 new_bang_dots(int xbang, int ybang, int dx, int dy, SDL_Surface *s)
 132 {
 133         int x,y,endcount;
 134         uint16_t *pixel,c;
 135         uint32_t colorkey;
 136         int row_inc;
 137         double theta,r;
 138         int begin_generate;
 139
 140         begin_generate = SDL_GetTicks();
 141         pixel = s->pixels;
 142         row_inc = s->pitch/sizeof(uint16_t) - s->w;
 143         colorkey = s->format->colorkey;
 144
 145         SDL_LockSurface(s);
 146
 147         endcount = 0;
 148         while (endcount<3) {
 149                 pixel = s->pixels;
 150                 for(y=0; y<s->h; y++) {
 151                         for(x = 0; x<s->w; x++) {
 152                                 c = *pixel++;
 153                                 if(c && c != colorkey) {
 154                                         theta = frnd()*M_PI*2;
 155                                         r = frnd(); r = 1 - r*r;
 156                                         // r = 1 - frnd()*frnd();
 157
 158                                         bdot[bd2].dx = 45*r*cos(theta) + dx;
 159                                         bdot[bd2].dy = 45*r*sin(theta) + dy;
 160                                         bdot[bd2].x = x + xbang;
 161                                         bdot[bd2].y = y + ybang;
 162                                         bdot[bd2].c = 0;
 163                                         bdot[bd2].life = 100;
 164                                         bdot[bd2].decay = frnd()*3 + 1;
 165                                         bdot[bd2].active = 1;
 166
 167                                         // Replace the last few bang dots with the pixels from the exploding object
 168                                         if(endcount>0) bdot[bd2].c = c;
 169
 170                                         bd2 = (bd2+1) % MAXBANGDOTS;
 171                                 }
 172                                 pixel += row_inc;
 173                         }
 174                 }
 175                 if(SDL_GetTicks() - begin_generate > 7) endcount++;
 176         }
 177
 178         SDL_UnlockSurface(s);
 179 }
 180
 181 void
 182 draw_bang_dots(SDL_Surface *s)
 183 {
 184         int i;
 185         int first_i, last_i;
 186         uint16_t *pixels, *pixel, c;
 187         int row_inc = s->pitch/sizeof(uint16_t);
 188
 189         pixels = (uint16_t *) s->pixels;
 190         first_i = -1;
 191         last_i = 0;
 192
 193         for(i=0; i<MAXBANGDOTS; i++) {
 194                 if(!bdot[i].active) continue;
 195
 196                 // If the dot has drifted outside the screen, kill it
 197                 if(bdot[i].x < 0 || bdot[i].x >= XSIZE || bdot[i].y < 0 || bdot[i].y >= YSIZE) {
 198                         bdot[i].active = 0;
 199                         continue;
 200                 }
 201                 if(pixel_hit_rocks(bdot[i].x, bdot[i].y)) { bdot[i].active = 0; continue; }
 202                 pixel = pixels + row_inc*(int)(bdot[i].y) + (int)(bdot[i].x);
 203                 if(bdot[i].c) c = bdot[i].c; else c = heatcolor[(int)(bdot[i].life)*3];
 204                 *pixel = c;
 205                 bdot[i].life -= bdot[i].decay;
 206                 bdot[i].x += bdot[i].dx*t_frame - xscroll;
 207                 bdot[i].y += bdot[i].dy*t_frame - yscroll;
 208
 209                 if(bdot[i].life<0) bdot[i].active = 0;
 210         }
 211 }
 212
 213
 214 void
 215 new_engine_dots(int n, int dir) {
 216         int i;
 217         float a, r;  // angle, random length
 218         float dx, dy;
 219         float hx, hy; // half ship width/height.
 220         static const int s[4] = { 2, 1, 0, 1 };
 221
 222         hx = surf_ship->w / 2;
 223         hy = surf_ship->h / 2;
 224
 225         for(i = 0; i<n; i++) {
 226                 if(dotptr->active == 0) {
 227                         a = frnd()*M_PI + (dir-1)*M_PI_2;
 228                         r = sin(frnd()*M_PI);
 229                         dx = r * cos(a);
 230                         dy = r * -sin(a);  // screen y is "backwards".
 231
 232                         dotptr->active = 1;
 233                         dotptr->x = shipx + s[dir]*hx + (frnd()-0.5)*3;
 234                         dotptr->y = shipy + s[(dir+1)&3]*hy + (frnd()-0.5)*3;
 235                         if(dir&1) {
 236                                 dotptr->dx = shipdx + 2*dx;
 237                                 dotptr->dy = shipdy + 20*dy;
 238                                 dotptr->life = 60 * fabs(dy);
 239                         } else {
 240                                 dotptr->dx = shipdx + 20*dx;
 241                                 dotptr->dy = shipdy + 2*dy;
 242                                 dotptr->life = 60 * fabs(dx);
 243                         }
 244
 245                         if(dotptr - edot < MAXENGINEDOTS-1) dotptr++;
 246                         else dotptr = edot;
 247                 }
 248         }
 249 }
 250
 251 void
 252 draw_engine_dots(SDL_Surface *s) {
 253         int i;
 254         uint16_t c;
 255         uint16_t *pixels = (uint16_t *) s->pixels;
 256         int row_inc = s->pitch/sizeof(uint16_t);
 257         int heatindex;
 258
 259         for(i = 0; i<MAXENGINEDOTS; i++) {
 260                 if(!edot[i].active) continue;
 261                 edot[i].x += edot[i].dx*t_frame - xscroll;
 262                 edot[i].y += edot[i].dy*t_frame - yscroll;
 263                 edot[i].life -= t_frame*3;
 264                 if(edot[i].life < 0
 265                                 || edot[i].x<0 || edot[i].x >= XSIZE
 266                                 || edot[i].y<0 || edot[i].y >= YSIZE) {
 267                         edot[i].active = 0;
 268                         continue;
 269                 }
 270                 if(pixel_hit_rocks(edot[i].x, edot[i].y)) { edot[i].active = 0; continue; }
 271                 heatindex = edot[i].life * 6;
 272                 c = heatindex>3*W ? heatcolor[3*W-1] : heatcolor[heatindex];
 273                 pixels[row_inc*(int)(edot[i].y) + (int)(edot[i].x)] = c;
 274         }
 275 }
 276
 277 void
 278 drawdots(SDL_Surface *s) {
 279         int m;
 280
 281         // Create engine dots out the side we're moving from
 282         for(m = 0; m<4; m++) {
 283                 if(jets & 1<<m) { // 'jets' is a bit field
 284                         new_engine_dots(80,m);
 285                 }
 286         }
 287
 288         move_dust();
 289
 290         SDL_LockSurface(s);
 291         draw_dust(s);
 292         draw_engine_dots(s);
 293         draw_bang_dots(s);
 294         SDL_UnlockSurface(s);
 295 }
 296
 297 int
 298 init(void) {
 299
 300         int i;
 301         SDL_Surface *temp;
 302         Uint32 flag;
 303
 304         // Where are our data files?
 305         if(!find_files()) exit(1);
 306         read_high_score_table();
 307
 308         if(opt_sound) {
 309                 // Initialize SDL with audio and video
 310                 if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
 311                         opt_sound = 0;
 312                         printf ("Can't open sound, starting without it\n");
 313                         atexit(SDL_Quit);
 314                 } else {
 315                         atexit(SDL_Quit);
 316                         atexit(SDL_CloseAudio);
 317                         opt_sound = init_sound();
 318                 }
 319         } else {
 320                 // Initialize with video only
 321                 CONDERROR(SDL_Init(SDL_INIT_VIDEO) != 0);
 322                 atexit(SDL_Quit);
 323         }
 324
 325         play_tune(TUNE_TITLE_PAGE);
 326
 327         // Attempt to get the required video size
 328         flag = SDL_DOUBLEBUF | SDL_HWSURFACE;
 329         if(opt_fullscreen) flag |= SDL_FULLSCREEN;
 330         surf_screen = SDL_SetVideoMode(XSIZE,YSIZE,16,flag);
 331
 332         // Set the title bar text
 333         SDL_WM_SetCaption("Variations on Rockdodger", "VoR");
 334
 335         NULLERROR(surf_screen);
 336
 337         // Set the heat color from the range 0 (cold) to 300 (blue-white)
 338         for(i = 0; i<W*3; i++) {
 339                 heatcolor[i] = SDL_MapRGB(
 340                         surf_screen->format,
 341                         (i<W)?(i*M/W):(M),(i<W)?0:(i<2*W)?((i-W)*M/W):M,(i<2*W)?0:((i-W)*M/W) // Got that?
 342                 );
 343         }
 344
 345         // Load the banners
 346         NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
 347         NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
 348
 349         NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
 350         NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
 351
 352         NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
 353         NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
 354
 355         NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
 356         NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
 357
 358         NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
 359         NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
 360
 361         surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
 362         g_font = SFont_InitFont(surf_font_big);
 363
 364         // Load the spaceship graphic.
 365         NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
 366         NULLERROR(surf_ship = SDL_DisplayFormat(temp));
 367         get_shape(surf_ship, &shipshape);
 368
 369         // Load the life indicator (small ship) graphic.
 370         NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
 371         NULLERROR(surf_life = SDL_DisplayFormat(temp));
 372
 373         init_engine_dots();
 374         init_dust();
 375
 376         init_rocks();
 377
 378         // Remove the mouse cursor
 379 #ifdef SDL_DISABLE
 380         SDL_ShowCursor(SDL_DISABLE);
 381 #endif
 382
 383         return 0;
 384 }
 385
 386 int
 387 draw() {
 388         int i;
 389         SDL_Rect dest;
 390         int bang, x;
 391         char *text;
 392         float fadegame,fadeover;
 393
 394         bang = 0;
 395
 396         // Draw a fully black background
 397         SDL_FillRect(surf_screen,NULL,0);
 398
 399         // Draw the background dots
 400         drawdots(surf_screen);
 401
 402         // Draw ship
 403         if(state == GAMEPLAY ) {
 404                 dest.x = shipx;
 405                 dest.y = shipy;
 406                 SDL_BlitSurface(surf_ship,NULL,surf_screen,&dest);
 407         }
 408
 409         draw_rocks();
 410
 411         // Draw the life indicators.
 412         if(state == GAMEPLAY || state == DEAD_PAUSE || state == GAME_OVER) {
 413                 for(i = 0; i<nships-1; i++) {
 414                         dest.x = (i + 1)*(surf_life->w + 10);
 415                         dest.y = 20;
 416                         SDL_BlitSurface(surf_life, NULL, surf_screen, &dest);
 417                 }
 418         }
 419
 420         // Draw the score
 421         snprintscore_line(topline, 50, score);
 422         SFont_Write(surf_screen, g_font, XSIZE-250, 0, topline);
 423
 424         // If it's game over, show the game over graphic in the dead centre
 425         switch (state) {
 426                 case GAME_OVER:
 427                         if(fadetimer<3.0/faderate) {
 428                                 fadegame = fadetimer/(3.0/faderate);
 429                         } else {
 430                                 fadegame = 1.0;
 431                         }
 432
 433                         if(fadetimer<3.0/faderate) {
 434                                 fadeover = 0.0;
 435                         } else if(fadetimer<6.0/faderate) {
 436                                 fadeover = ((3.0/faderate)-fadetimer)/(6.0/faderate);
 437                         } else {
 438                                 fadeover = 1.0;
 439                         }
 440
 441                         dest.x = (XSIZE-surf_b_game->w)/2;
 442                         dest.y = (YSIZE-surf_b_game->h)/2-40;
 443                         SDL_SetAlpha(surf_b_game, SDL_SRCALPHA, (int)(fadegame*(200 + 55*cos(fadetimer += t_frame/1.0))));
 444                         SDL_BlitSurface(surf_b_game,NULL,surf_screen,&dest);
 445
 446                         dest.x = (XSIZE-surf_b_over->w)/2;
 447                         dest.y = (YSIZE-surf_b_over->h)/2 + 40;
 448                         SDL_SetAlpha(surf_b_over, SDL_SRCALPHA, (int)(fadeover*(200 + 55*sin(fadetimer))));
 449                         SDL_BlitSurface(surf_b_over,NULL,surf_screen,&dest);
 450                 break;
 451
 452                 case TITLE_PAGE:
 453
 454                         dest.x = (XSIZE-surf_b_variations->w)/2 + cos(fadetimer/6.5)*10;
 455                         dest.y = (YSIZE/2-surf_b_variations->h)/2 + sin(fadetimer/5.0)*10;
 456                         SDL_SetAlpha(surf_b_variations, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer += t_frame/2.0)));
 457                         SDL_BlitSurface(surf_b_variations,NULL,surf_screen,&dest);
 458
 459                         dest.x = (XSIZE-surf_b_on->w)/2 + cos((fadetimer + 1.0)/6.5)*10;
 460                         dest.y = (YSIZE/2-surf_b_on->h)/2 + surf_b_variations->h + 20 + sin((fadetimer + 1.0)/5.0)*10;
 461                         SDL_SetAlpha(surf_b_on, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-1.0)));
 462                         SDL_BlitSurface(surf_b_on,NULL,surf_screen,&dest);
 463
 464                         dest.x = (XSIZE-surf_b_rockdodger->w)/2 + cos((fadetimer + 2.0)/6.5)*10;
 465                         dest.y = (YSIZE/2-surf_b_rockdodger->h)/2 + surf_b_variations->h + surf_b_on->h + 40 + sin((fadetimer + 2.0)/5)*10;
 466                         SDL_SetAlpha(surf_b_rockdodger, SDL_SRCALPHA, (int)(200 + 55*sin(fadetimer-2.0)));
 467                         SDL_BlitSurface(surf_b_rockdodger,NULL,surf_screen,&dest);
 468
 469                         text = "Version " VERSION;
 470                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + sin(fadetimer/4.5)*10;
 471                         SFont_Write(surf_screen,g_font,x,YSIZE-50 + sin(fadetimer/2)*5,text);
 472
 473                         text = sequence[(int)(fadetimer/40)%NSEQUENCE];
 474                         //text = "Press SPACE to start!";
 475                         x = (XSIZE-SFont_TextWidth(g_font,text))/2 + cos(fadetimer/4.5)*10;
 476                         SFont_Write(surf_screen,g_font,x,YSIZE-100 + cos(fadetimer/3)*5,text);
 477                 break;
 478
 479                 case HIGH_SCORE_ENTRY:
 480                         play_tune(TUNE_HIGH_SCORE_ENTRY);
 481                         if(!process_score_input()) {  // done inputting name
 482
 483                                 // Change state to briefly show high scores page
 484                                 state = HIGH_SCORE_DISPLAY;
 485                                 state_timeout = 200;
 486
 487                                 // Write the high score table to the file
 488                                 write_high_score_table();
 489
 490                                 play_tune(TUNE_TITLE_PAGE);
 491                         }
 492                 // FALL THROUGH TO
 493                 case HIGH_SCORE_DISPLAY:
 494                         // Display de list o high scores mon.
 495                         display_scores(surf_screen, 150,50);
 496                         break;
 497                 case GAMEPLAY:
 498                 case DEAD_PAUSE:
 499                         ; // no action necessary
 500         }
 501
 502         if(state == GAMEPLAY) {
 503                 bang = hit_rocks(shipx, shipy, &shipshape);
 504         }
 505
 506         ms_frame = SDL_GetTicks() - ms_end;
 507         ms_end += ms_frame;
 508         if(ms_frame>200 || ms_frame<0) {
 509                 // We won't run at all below 5 frames per second.
 510                 // This also happens if we were paused, grr.
 511                 t_frame = 0;
 512                 ms_frame = 0;
 513         } else {
 514                 t_frame = opt_gamespeed * ms_frame / 50;
 515                 if(state == GAMEPLAY) score += ms_frame;
 516         }
 517
 518         // Update the surface
 519         SDL_Flip(surf_screen);
 520
 521
 522         return bang;
 523 }
 524
 525 int
 526 gameloop() {
 527         Uint8 *keystate;
 528         float tmp;
 529
 530
 531         for(;;) {
 532                 if(!paused) {
 533                         // Count down the game loop timer, and change state when it gets to zero or less;
 534
 535                         if((state_timeout -= t_frame*3) < 0) {
 536                                 switch(state) {
 537                                         case DEAD_PAUSE:
 538                                                 // Create a new ship and start all over again
 539                                                 state = GAMEPLAY;
 540                                                 play_tune(TUNE_GAMEPLAY);
 541                                                 break;
 542                                         case GAME_OVER:
 543                                                 if(new_high_score(score)) {
 544                                                         SDL_Event e;
 545                                                         state = HIGH_SCORE_ENTRY;
 546                                                         state_timeout = 5.0e6;
 547                                                         SDL_EnableUNICODE(1);
 548                                                         while(SDL_PollEvent(&e))
 549                                                                 ;
 550                                                 } else if(!keystate[SDLK_SPACE]) {
 551                                                         state = HIGH_SCORE_DISPLAY;
 552                                                         state_timeout = 400;
 553                                                 }
 554                                                 break;
 555                                         case HIGH_SCORE_DISPLAY:
 556                                                 state = TITLE_PAGE;
 557                                                 state_timeout = 500.0;
 558                                                 break;
 559                                         case HIGH_SCORE_ENTRY:
 560                                                 break;
 561                                         case TITLE_PAGE:
 562                                                 state = HIGH_SCORE_DISPLAY;
 563                                                 state_timeout = 200.0;
 564                                                 break;
 565                                         case GAMEPLAY:
 566                                                 ; // no action necessary
 567                                 }
 568                         } else {
 569                                 if(state == DEAD_PAUSE) {
 570                                         float blast_radius;
 571                                         int fixonly;
 572
 573                                         if(state_timeout < DEAD_PAUSE_LENGTH - 20.0) {
 574                                                 blast_radius = BLAST_RADIUS * 1.3;
 575                                                 fixonly = 1;
 576                                         } else {
 577                                                 blast_radius = BLAST_RADIUS * (DEAD_PAUSE_LENGTH - state_timeout) / 20.0;
 578                                                 fixonly = 0;
 579                                         }
 580                                         blast_rocks(bangx, bangy, blast_radius, fixonly);
 581
 582                                         if(bangx < 60) bangx = 60;
 583                                 }
 584                         }
 585
 586                         new_rocks();
 587
 588                         // INERTIA
 589                         shipx += shipdx*t_frame;
 590                         shipy += shipdy*t_frame;
 591
 592                         // SCROLLING
 593                         tmp = (shipy-YSCROLLTO)/25 + (shipdy-screendy);
 594                         screendy += tmp * t_frame/12;
 595                         tmp = (shipx-XSCROLLTO)/25 + (shipdx-screendx);
 596                         screendx += tmp * t_frame/12;
 597                         // taper off so we don't hit the barrier abruptly.
 598                         // (if we would hit in < 2 seconds, adjust to 2 seconds).
 599                         if(back_dist + (screendx - SCREENDXMIN)*TO_TICKS(2) < 0) {
 600                                 screendx = SCREENDXMIN - (back_dist/TO_TICKS(2));
 601                         }
 602
 603                         back_dist += (screendx - SCREENDXMIN)*t_frame;
 604                         if(opt_max_lead >= 0) back_dist = min(back_dist, opt_max_lead);
 605
 606                         xscroll = screendx * t_frame;
 607                         yscroll = screendy * t_frame;
 608
 609                         shipx -= xscroll;
 610                         shipy -= yscroll;
 611
 612                         // move bang center
 613                         bangx += bangdx*t_frame - xscroll;
 614                         bangy += bangdy*t_frame - yscroll;
 615
 616                         move_rocks();
 617
 618
 619                         // BOUNCE X
 620                         if(shipx<0 || shipx>XSIZE-surf_ship->w) {
 621                                 // BOUNCE from left and right wall
 622                                 shipx -= (shipdx-screendx)*t_frame;
 623                                 shipdx = screendx - (shipdx-screendx)*opt_bounciness;
 624                         }
 625
 626                         // BOUNCE Y
 627                         if(shipy<0 || shipy>YSIZE-surf_ship->h) {
 628                                 // BOUNCE from top and bottom wall
 629                                 shipy -= (shipdy-screendy)*t_frame;
 630                                 shipdy = screendy - (shipdy-screendy)*opt_bounciness;
 631                         }
 632
 633
 634                         if(draw() && state == GAMEPLAY) {
 635                                 // Died
 636                                 play_sound(SOUND_BANG); // Play the explosion sound
 637                                 bangx = shipx; bangy = shipy; bangdx = shipdx; bangdy = shipdy;
 638                                 new_bang_dots(shipx,shipy,shipdx,shipdy,surf_ship);
 639                                 shipdx *= 0.5; shipdy *= 0.5;
 640                                 if(shipdx < SCREENDXMIN) shipdx = SCREENDXMIN;
 641                                 if(--nships <= 0) {
 642                                         state = GAME_OVER;
 643                                         shipdx = SCREENDXMIN; shipdy = 0;
 644                                         state_timeout = 200.0;
 645                                         fadetimer = 0.0;
 646                                         faderate = t_frame;
 647                                 }
 648                                 else {
 649                                         state = DEAD_PAUSE;
 650                                         state_timeout = DEAD_PAUSE_LENGTH;
 651                                 }
 652                         }
 653
 654                         SDL_PumpEvents();
 655                         keystate = SDL_GetKeyState(NULL);
 656
 657                         // new game
 658                         if(keystate[SDLK_SPACE] && (state == HIGH_SCORE_DISPLAY || state == TITLE_PAGE)) {
 659
 660                                 reset_rocks();
 661
 662                                 nships = 4;
 663                                 score = 0;
 664
 665                                 state = GAMEPLAY;
 666                                 play_tune(TUNE_GAMEPLAY);
 667
 668                                 shipx = XSIZE/2.2; shipy = YSIZE/2;
 669                                 shipdx = screendx; shipdy = screendy;
 670                         }
 671
 672                         jets = 0;
 673                 } else {
 674                         SDL_PumpEvents();
 675                         keystate = SDL_GetKeyState(NULL);
 676                 }
 677
 678                 if(state == GAMEPLAY) {
 679                         if(!paused) {
 680                                 if(keystate[SDLK_LEFT]  | keystate[SDLK_h]) { shipdx -= 1.5*t_frame; jets |= 1<<0;}
 681                                 if(keystate[SDLK_DOWN]  | keystate[SDLK_t]) { shipdy += 1.5*t_frame; jets |= 1<<1;}
 682                                 if(keystate[SDLK_RIGHT] | keystate[SDLK_n]) { shipdx += 1.5*t_frame; jets |= 1<<2;}
 683                                 if(keystate[SDLK_UP]    | keystate[SDLK_c]) { shipdy -= 1.5*t_frame; jets |= 1<<3;}
 684                                 if(keystate[SDLK_3])            { SDL_SaveBMP(surf_screen, "snapshot.bmp"); }
 685                         }
 686
 687                         if(keystate[SDLK_p] | keystate[SDLK_s]) {
 688                                 if(!pausedown) {
 689                                         paused = !paused;
 690                                         pausedown = 1;
 691                                 }
 692                         } else {
 693                                 pausedown = 0;
 694                         }
 695                 } else if(state == GAME_OVER) {
 696                         if(keystate[SDLK_SPACE]) {
 697                                 state_timeout = -1;
 698                         }
 699                 }
 700
 701                 if(state != HIGH_SCORE_ENTRY && (keystate[SDLK_q] || keystate[SDLK_ESCAPE])) {
 702                         return 0;
 703                 }
 704
 705         }
 706 }
 707
 708 int
 709 main(int argc, char **argv) {
 710         init_opts();
 711         argp_parse(&argp, argc, argv, 0, 0, 0);
 712
 713         if(init()) {
 714                 printf ("ta: '%s'\n",initerror);
 715                 return 1;
 716         }
 717
 718         gameloop();
 719
 720         return 0;
 721 }